Dual control for automatic electric ranges



Nov. 21, 1933. R. c. wx-:Y

\ `DUAL: CONTROL FOR AUTOMATIC ELECTRIC RANGE-IS Filed March 25, 193:5

amwm .Swnwmw W@ C S ii EL@ ma wm .A l E! mm buv .kw r

www w l 3] NAM@ u m Patented Nov. 21, 1933 UNITED STATES PATENT OFFICE DUAL CONTROL FR AUTGMATIC vELECTRIC RANG S Claims.

The invention relates to automatic electric ranges and more particularly to a dual control for such ranges whereby the oven and the hot plates of the range, as well as any appliances or other electrically heated devices associated therewith, may be selectively connected with either of two automatic circuits controlled by time switches for automatically closing and opening the circuits at predetermined times.

The object of the improvement is to provide a dual time switch adapted to control two automatic circuits, means being provided for selectively connecting the oven and each of the hot plates or other electrically heated devices associated with an electric range to either one of said automatic circuits or to a non-automatic circuit as desired.

The above and other objects may be attained by constructing the improved dual control in the manner illustrated in the accompanying drawing, in which Figure 1 is a diagrammatic view of the circuits and devices embodying the invention;

Fig. 2, a detached elevation of the dual time switch; and

Fig. 3, a diagrammatic plan view of the same.

Similar numerals refer to similar parts throughout the drawing.

The main circuit wires are shown at A, B and N, the latter representing the neutral wire. The usual non-automatic circuit for the range comprises the wires A' and B' which are connected to the main circuit wires A and B respectively, and the wire N connected to the neutral main -circuit wire N. The automatic circuits A and B" are connected to the main circuit wires A and B respectively.

The heating elements for the oven, which may be of any usual and well known construction, are indicated at 1, the wires 2, 3 and 4 from each of these heating elements leading to a four-position, three-heat indicating switch oi any well known design indicated generally at 5. A wire 6 leads from each of these switches 5 to the neutral wire N' and a Wire 7 leads from each of these switches to a contact 8, a similar contact 3 being spaced therefrom and connected by the wire 7 with a three-position, throw-over snap switch of any well known design comprising generally the movable switch blade 9 and the contacts l0, 11 and 12.

The circuit through the wires 7, 7 is normally closed by means oi an electromagnet operated, one pole circuit breaker 13 normally held in contact with the contact points 8 and 8 as by a (Cl. 21S-20) L.spring i4 and adapted to be moved out of contact therewith by the electromagnet 15.

An adjustable, contact-making, temperature indicating, helical expansion thermostat, of any usual construction, is indicated generally at 16 60 and is connected by the wire 17 to the neutral wire N and by the wire 18, through the electromagnet 1,5, with the switch blade 9. This thermostat, as well as the circuit breaker 13, does not form any part of the present invention but may be of any usual and well known design, such as ordinarily used in the ovens of electric ranges, adapted for controlling the temperature of the oven.

The contact point 1040i the three-position switch is connected to the non-automatic bus B', the contact ll to the automatic bus A and the contact 12 to the automatic bus B". Thus by throwing the switch blade 9 into contact with any desired one of the contact points 10, 11 or 75 12, the heating elements of the oven may be placed in the non-automatic circuit or in either one of the automatic circuits.

The automatic bus A is broken between the main circuit line A and the three-position switch 9, being provided with the spacedcontacts 19 adapted to be engaged by the circuitbreaker 20 normally held in open position as by a spring 21 and adapted to be moved into engagement with the contacts 19 by the .electromagnet 22. A simi- 85 lar break is provided in the automatic bus B, the Acontacts 19a therein being arranged to be engaged by the circuit breaker 20a normally held in open position by a spring 21a and arranged to be closed by the electromagnet 22a.

A warming oven heating element may be provided as indicated at 23, connected by wires 24 and 25 to the neutral bus N and non-automatic bus A respectively and provided with a manually operated switch 26 as in usual practice. A 95 plurality of hot plate heating elements is indicated at 27, each being connected by the wires 2a, 3a and 4a, to a four-position, three-heat, in dicating snap switch 5a of any usual design. Each of these snap switches is connected by a wire 6a to the neutral bus N and by a wire 7a to the switch blade 9a oi a three-position, throwover switch provided with the contacts 10a, lla and 12a.

The contacts lila of certain of these switches may be connected to the non-automatic bus A and of others of the switches to the non-autoa matic bus B. The contacts 11a and 12a oi each of these switches are connected to the auto- :matic busses A and B respectively, so that M0 gear 39 drives the spindles 40 and 'each of the hot plate elements, in the same manner as the oven elements, may be selectiveliv connected to the non-automatic circuit or to either one of the automatic circuits as desired.

An egg cooker or other device, as indicated generally at 28, may be connected by a wire 22 to the neutral bus N' and by a wire 30 to the switch blade 9b of a three-position switch having the contacts 10b, 11b and 12b connected to one of the non-automatic busses as B and' to the automatic busses A" and B" respectively. A manuallycontrolled switch 31 may be provided for operating this egg cocker or other device.

In the same manner the appliance outlet 32 may be connected by a wire 33 with the neutral bus N and by a wire 34 with the switch blade 9c of a three-position switch having the contacts 10c, llc and 12o connected to one of the non` automatic busses as A and to the automatic busses A and B respectively. With this construction the oven, the hot plates, the egg cooker or other device and the appliance outlets may be independently and selectively connected to one of the non-'automatic busses or to either of the automatic busses as desired. The usual lamp ordinarily provided on electric ranges is indicated at 35 and connected by the wires 36 and 37 to the neutral bus and one of the non-automatic busses respectively.

The circuit breakers 20 and 20a are adapted to be automaticallyclosed and opened by means of a dual time control switch driven by the synchronous motor 38 which through a reducing 40. This motor may be connected by a wire 41 to the neutral line wire N and by a wire 42 to one of the line wires A or B. A pair of cams 43 is mounted upon each spindle, the cams on each spindle being adapted to be independently. rotated upon the spindle and set at any desired position by means of the hands 44 which cooperate with dials 45 to indicate the time at which each of the automatic circuit-s is set to close and open.

A manually controlled switch 46 is provided for closing the circuit to the synchronous motor 38 and manual switches 47 are provided for closing circuits from each of the time switches to the corresponding magnets 22 and' 22a. These circuits, however, remain normally open until the cams 43 are moved to the close the same. Each of these circuits may ,comprise the Wire 42 leading to one of the li/nes A or B and the wires 48 and 48a leading to the relays 22 land 22a respectively, the circuit being normally broken between the contacts 49 and 50, which are operated by the cams 43 and adapted to be closed when both of these movable contacts are lowered to rest upon the conductor member 51, at which time the corresponding relay 22 or 22a will operate the circuit breaker 20 or 20a, closing the automatic circuit A or B" respectively, and causing the same to remain closed until the cams 43 move to a position to break the circuit, at whichgtime the springs 21 or 21a Will open the automatic circuit.

It will thus be seen that each of the time Aswitches may be set to close the corresponding automatic circuit at any desired future time and to hold the same closed for any desired period of time. Thus, for instance, the time switches may be set so that the automatic circuit A" will close at three oclock and open at five oclock While the automatic circuit B" may be set to close at four oclock and open at ilve fteen or proper position to inseriert any other desired time. Then by means of the three-pcsition switches 9, 9a, 9b or 9c, the oven, hot plates and other devices and appliances may be each independently and selectively connected to either automatic circuit A" or B" or if desired, to one' of the non-automatic circuits so that food may be cooked for any desired time upon each of the elements.

I claim:

1, In an electric range having a plurality of heating elements, two automatic circuits, means for independently controlling the closing and -opening of each automatic circuit at. predetermined definite times, and means for selectively connecting each of said heating elements to either one of said automatic circuits.

2. In an electric range having a. plurality of heating elements, a non-automatic circuit, two automatic circuits, means for independently controlling the closing and opening of each automatic circuit at predetermined denite times, and means for selectively connecting each of said heating elements to any one of said circuits.

3. In an 'electric range having an oven and a plurality of hot plates, heating elements in said oven andhot plates, two automatic circuits, means for independently controlling the closing and opening of each automatic circuit at predetermined denite times, and means for selectively connecting each of said heating elements to either one of said automatic circuits.

4. In an electric range having an oven and a plurality of hot plates, heating elements in said oven and hot plates, a non-automatic circuit, two automatic circuits, means for independently controlling'the closing and opening of each automatic circuit at predetermined denite times, and means for selectively connecting each of said heating elements to any one of said circuits.

5. In an electric range having a plurality of heating elements, two automatic circuits, a dual time switch for independently controlling the closing and opening of each automatic circuit at predetermined definite times, and means for selectively connecting each of said heating elements to either one of of said circuits.

6. In an electric range having a plurality of heating elements, a non-automatic circuit, two automatic circuits, a dual time-switch for independently controlling the closing and opening of each automatic circuit at predetermined definite times, and means for selectively connecting each of said heating elementsrto any one of said cir-- cuits.

7. In an electric range having an oven, a plurality of hot plates and an appliance outlet, heating elements in said oven and hot plates, two automatic circuits, a dual time switch for independently controlling the closing and opening oi' each automaticV circuit at predetermined definite times, and means for selectively connecting each of said heating elements and said appliance outlet to either one of said circuits.

8.v In an electric range having an oven, a plurality of hot plates and an appliance outlet, heating elements in said oven and hot plates, anonautomatic circuit, two automatic circuits, a dual time switch for independently controlling the closing and opening of each automatic circuit at predetermined definite times, and means for selectively connecting each of said heating elements and said appliance outlet to any one of said circuits.

RAYMOND C. WEY. 

